CT-5/501, Jedi General Glynn-Beti and a taskforce of troopers engaged the Separatists on Raxus Prime, attempting to destroy Count Dooku's Dark Reaper superweapon. while fighting their mission, 5/501 and a squad ran into the young bounty hunter Boba Fett. Under the alias of Teff, Fett tricked the trooper into allowing him to get in and receive food and shelter.
During the fight, Super Battle droids attacked the shelter, forcing the refugees to take cover behind an Excavation rig. CT-5/501 was one of the last remaining troopers in his squad, with Fett joining the fight as well. They provided cover fire for the refugees despite being heavily outnumbered. One of the troopers fell, leaving CT-4/619, Fett and CT-5/501 remaining. Beti arrived soon afterwards, drawing the attention off of the clones, giving them the ability to fire without retaliation. Once they eliminated the droid threat, the troopers and Fett jumped in an LAAT. 4/619 confiscated Fett's blaster, while they waited for 5/501 to board. Before taking off, 4/619 informed Beti of the orphan boy they had picked up. They then proceeded to take off to orbit, where the Candaserri was.
As they flew away from the surface, a Vulture droid attacked them, but the rear cannon blew the ship away before they were hit. The ship docked in the hangar bay and the two troopers took Fett to Beti and Jedi Commander Ulu Ulix.
- Boba Fett: Crossfire
- The Complete Star Wars Encyclopedia, Vol I ("CT-5/501")